public static DataTable BulkGetEmptyDataTable(this DbAccessor db, string tableName)
{
DataTable dt = db.QueryDataTable(string.Format("select * from {0} where 1=2", tableName));
dt.TableName = tableName;
return(dt);
}
public static DbAccessor NewDbAccessor(string connectionString, string providerName)
{
DbAccessor dba = null;
if (string.IsNullOrEmpty(providerName) ||
providerName == "System.Data.SqlClient" ||
providerName.ToLower() == DbProviderName.SqlServer.ToString().ToLower())
{
dba = new SqlServerAccessor(connectionString);
}
else if (providerName.ToLower() == DbProviderName.MySql.ToString().ToLower() ||
providerName == "MySql.Data.MySqlClient")
{
dba = new MySqlAccessor(connectionString);
}
else
{
Type tProviderName = Type.GetType(providerName);
if (tProviderName == null)
{
throw new Exception(string.Format("ConnectionString（{0}）的ProviderName（{1}）找不到该类型！", connectionString, providerName));
}
//else if (!(tProviderName.IsSubclassOf(typeof(DbAccessor))))
//{
// throw new Exception(string.Format("ConnectionString（{0}）的ProviderName（{1}）该类型不是DbAccessor的实现类！", connectionString, providerName));
//}
object oProviderName = Activator.CreateInstance(tProviderName, connectionString);
dba = oProviderName as DbAccessor;
}
return(dba);
}
public static int Delete <T>(this DbAccessor db, object objIdParameters)
{
var tableMapping = new TableMapping(typeof(T));
ISqlBuilder sqlBuilder = new DefaultSqlBuilder(tableMapping);
#region 处理参数为基础类型，即直接为主键的值
if (objIdParameters.GetType() == typeof(string) || objIdParameters.GetType().IsPrimitive)
{
var dicParam = new Dictionary <string, object>();
var keyColumns = tableMapping.GetKeyColumns();
if (keyColumns.Count == 0)
{
throw new Exceptions.EntityException("实体没有设置主键！");
}
string keyColumnName = keyColumns[0].ColumnName;
dicParam.Add(keyColumnName, objIdParameters);
objIdParameters = dicParam;
}
#endregion
return(db.ExecuteNonQuery(sqlBuilder.BuildDelete(), objIdParameters));
}
public static IList <T> SelectList <T>(this DbAccessor db, object objParameters)
{
var tableMapping = new TableMapping(typeof(T));
ISqlBuilder sqlBuilder = new DefaultSqlBuilder(tableMapping);
return(db.QueryEntities <T>(sqlBuilder.BuildSelectList(), objParameters));
}
public static void BulkWriteToServer(this DbAccessor db, string tableName, DbDataReader reader, int batchSize = 0, params BulkCopyColumnMapping[] columnMappings)
{
DbBulkCopy dbBulkCopy = DbBulkCopyFactory.GetDbBulkCopy(db, db.ConnectionString);
dbBulkCopy.BulkCopyTimeout = db.CommandTimeout;
dbBulkCopy.DbTransaction = db.DbTransaction;
dbBulkCopy.WriteToServer(tableName, reader, batchSize, columnMappings);
}
public static int Insert <T>(this DbAccessor db, object objParameters)
{
var mapping = new TableMapping(typeof(T));
mapping.FilterColumn(objParameters);
ISqlBuilder sqlBuilder = new DefaultSqlBuilder(mapping);
return(db.ExecuteNonQuery(sqlBuilder.BuildInsert(), objParameters));
}
public static DbAccessor GetDbAccessor()
{
if (_dba == null)
{
lock (_objLock)
{
if (_dba == null)
{
_dba = CreateDbAccessor();
_dba.IsSingleton = true;
}
}
}
return(_dba);
}
public static int UpdateFields(this DbAccessor db, object objEntity, params string[] inclusiveFields)
{
List <string> lsInclusiveFields = new List <string>();
lsInclusiveFields.AddRange(inclusiveFields);
var mapping = new TableMapping(objEntity.GetType());
foreach (var item in mapping.GetKeyColumns())
{
lsInclusiveFields.Add(item.ColumnName);
}
mapping.FilterColumn(lsInclusiveFields.ToArray());
ISqlBuilder sqlBuilder = new DefaultSqlBuilder(mapping);
return(db.ExecuteNonQuery(sqlBuilder.BuildUpdate(), objEntity));
}
public static DbAccessor CreateDbAccessor(string connectionString, string providerName)
{
DbAccessor dba = NewDbAccessor(connectionString, providerName);
if (dba != null)
{
IEnumerable <IDbExecuteHandler> dbExecuteHandlers = DbExecuteHandlerFactory.GetDbExecuteHandlers();
foreach (IDbExecuteHandler handler in dbExecuteHandlers)
{
dba.PreCommandExecute += handler.HandleExecute;
}
}
return(dba);
}
public static IList <T> PageQueryEntities <T>(this DbAccessor db,
string sql, string orderClause, int pageIndex, int rowCount, out int totalRowCount,
object objParameters = null)
{
DbPaging paging = DbPagingFactory.GetDbPaging(db);
if (objParameters == null)
{
object objTotalRowCount = db.ExecuteScalar <object>(paging.GetCountSql(sql));
totalRowCount = Convert.ToInt32(objTotalRowCount);
int startRowIndex = 1 + (pageIndex - 1) * rowCount;
return(db.QueryEntities <T>(paging.GetPageSql(sql, orderClause, startRowIndex, rowCount)));
}
else
{
object objTotalRowCount = db.ExecuteScalar <object>(paging.GetCountSql(sql), objParameters);
totalRowCount = Convert.ToInt32(objTotalRowCount);
int startRowIndex = 1 + (pageIndex - 1) * rowCount;
return(db.QueryEntities <T>(paging.GetPageSql(sql, orderClause, startRowIndex, rowCount), objParameters));
}
}
public static int Update(this DbAccessor db, object objEntity)
{
ISqlBuilder sqlBuilder = new DefaultSqlBuilder(new TableMapping(objEntity.GetType()));
return(db.ExecuteNonQuery(sqlBuilder.BuildUpdate(), objEntity));
}
public static T Select <T>(this DbAccessor db, object objIdParameters)
{
ISqlBuilder sqlBuilder = new DefaultSqlBuilder(new TableMapping(typeof(T)));
return(db.QueryEntity <T>(sqlBuilder.BuildSelect(), objIdParameters));
}
public DbAccessorContext(DbAccessor dbAccessor, DbCommand dbCommand)
{
DbCommand = dbCommand;
DbAccessor = dbAccessor;
}